Meyer wildermann and robert ludwig mond



(No Model.)

M. WILDERMANN & R. L. MOND.

UHRONOGRAPH. No. 598,042. Patented Jan. 25, 1898.

Inventors 7118 e-r W11 aLerTn 1 1111) wobtft 7% 7 D Lfnesses UNITEDSTATES PATENT OFFICE.

MEYER WILDERMANN AND ROBERT LUDIVIG MOND, OF LONDON, ENGLAND.

CHRONOGRAPH.

SPECIFICATION forming part of Letters Patent No. 598,042, dated January25, 1898.

Application filed August 23, 1897.

T (tZZ 10710772, it may concern:

Be it known that we, MEYER \VILDERMANN, residing at Westbourne Road,Forest Hill, London, in the county of Surrey, and ROBERT 5 LUDWIG MOND,residing at Avenue Road, Regents Park, London, England, citizens ofEngland,have invented a certain new and useful Improvement inOhronographs, of which the following is a specification.

Our invention relates to the construction of a chronograph in such amanner that very little power is required to effect the record, as weshall describe, referring to the accompanying drawing, which is a sideview of a chro- I 5 nograph according to our invention arranged forrecording successive actions.

A is a stationary cylinder on which can be fixed paper or otherreceptive surface. In the center of the face of the cylinder a nut B 20is held by slide-bolts O or otherwise, on withdrawing which the nut canbe turned or removed. Through the nut passes the screwed part D of aspindle, which has a part E not threaded and journaled in a bearing F.On

the part E, which has a keyway-groove, is fitted a pulley or pinion G,with a key engaged in the groove. This pulley or pinion is arranged torevolve between the bearing F and a bracket f, so that it cannot movelengthwise up the spindle. On the screwed part D of the spindle, whichis insulated from E, is fixed an electromagnet II and a pair of arms J,from the ends of which project rods equal in length to the cylinder A,one of these carrying the 3 5 spring pin or tracer K, which can slide ashort distance along the rod, being urged to the right by a spring 713and being connected by a cord to the armature h of the electromagnet H.

The coil of the electromagnet I-I forms an 0 electrical connectionbetween D and E and the cylinder A, and bracket F being connected withan electrical-circuit battery and key in the usual way the chronographoperates as follows: The pulley or pinion G being driven by clockwork atany convenient speed, the screwed spindle D is caused to revolve andadvance through the nut B, the tracer K revolving round and advancingalong the cylinder A, so as to trace on it ahelical line. When- 5c everthe circuit of the electromagnet II is Serial No. 649,256. (No model.)

closed, it attracts its armature, so that the cord pulls the tracer K alittle back in opposition to the spring 7t, thus causing the tracer tomake a Zigzag mark indicating the moment when the electric circuit isclosed.

Although we have described that the tracer receives its momentarymovement by the agency of an electromagnet, obviously the cord could beacted on by mechanical connections from the instrument or other objectthe action of which has to be recorded.

Having thus described the nature of this invention and the best means weknow of carrying the same into practical effect, we claim 1. In achronograph, the combination with a stationary cylinder carrying athreaded nut, of a rotary spindle tapped through said nut, a power-wheelfixed to said spindle, an arm carried by the rotary spindle, a rodcarried by the arm and moving in a line parallel with the said cylinder,a pointer mounted to have a slight reciprocating movement upon said rod,a movable part, and a connection between said movable part and pointerwhereby the latter is given a slight backward movement when the saidmovable part is actuated, as and for the purpose specified.

2. In a chronograph the combination with a stationary cylinder carryinga threaded nut, of a rotary spindle tapped through said nut, apower-wheel fixed to said spindle, an arm carried by said rotaryspindle, a rod carried by the arm, a pointer mounted to have a slightreciprocating movement upon said rod, an electromagnet and an armaturetherefor, and a connection between said armature and pointer whereby thelatter is given a slight backward movement when the armature isattracted by the magnet, substantially as described.

3. In a chronograph, the combination with a stationary cylinder A,carrying a threaded nut B, clamps for holding said nut against rotation,a rotary spindle D, tapped through said nut, a power-wheel G, fixed tosaid spindle, an arm J, carried by the spindle, a rod projecting outfrom the said arm and lying parallel with the cylinder, a pointer K,mounted to have a slight reciprocating movement upon the end of saidrod, a spring 7c, act- I00 ing' upon the pointer, an electromagnet H,two subscribing witnesses, this 9th day of Auhaving an armature h, andaflexible connecgust, A. D. 1897.

tion between the said armature and pointer MEYER WILDERMANN' whereby thelatter is given a slight backward I movement when the armature isattracted by ROBERT LUDWIG M the magnet, substantially as described.

In testimony whereof wehave signed our names to this specification, inthe presence of Vitnesses:

J NO. P. M. MILLARD, FRED. O. HARRIS.

